#! /usr/bin/python3
# author ckm
from threading import Thread
import time

g_num = 100
def work1():
    global g_num
    for i in range(3):
        g_num += 1

    print('--- in work1,g_num is %d' % g_num)


def work2():
    global g_num
    print('--- in work2,g_num is %d' % g_num)


if __name__ == '__main__':
    t1 = Thread(target=work1)
    t1.start()
    time.sleep(1)
    t2 = Thread(target=work2)
    t2.start()
    t1.join()
    t2.join()
